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Join Date: Jul 2009
Location: Glasgow, Scotland
08-28-2009, 04:19 PM
Off-topic: You know, but when you are talking about computers and servers which run banks and stock exchanges, they can remove and add processors, RAM and complete systems while they are still running. Hot swappable parts do add to the price of a system though, most likely in the tune of several times the actual cost of hardware.
Join Date: Mar 2009
Location: United States
08-28-2009, 04:48 PM
Yes, that is because of a thing called redundancy. Servers are not only comprised of a single machine running with dual quad-core CPUs or and 32Gb of RAM... they are made up of many server blades redundantly configured in a rack.
If something goes wrong with one blade, there is failover and redundancy
In a system like this it is easy to upgrade/swap out/change RAM, storage, CPUs and power supplies. Imagine how big of a hassle it would be to do this without having a redundant system. There would be so much downtime it would be completely impractical for the business world!
(P.S. this is not only used in banks and stock exchanges... any large corporation, along with small businesses, have hot-swappable servers and a network that has been engineered for fail-over in case of natural disaster or maintenance)
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